Slim K4 External Battery Charger by Efest

Introducing the Efest Slim K4 Battery Charger - the ultimate charging solution for your lithium-ion batteries. With its 4-bay design, this charger allows you to charge multiple batteries simultaneously, saving you time and ensuring you never run out of power.

 One of the standout features of the Efest Slim K4 is its multiple charging speeds. It offers versatile charging options, including 1.0A x 2, 1.0A x 1, 0.5A x 4, and 0.50A x 3, allowing you to customize the charging process based on your specific needs. Each slot is equipped with independent monitoring, ensuring that each battery is charged safely and efficiently.

 Safety is a top priority with the Efest Slim K4. It automatically turns off when charging is complete, preventing overcharging and prolonging the lifespan of your batteries. Additionally, the reverse polarity protection feature safeguards against potential accidents, protecting both your batteries and the charger itself.

 The Efest Slim K4 Battery Charger is compatible with various lithium-ion batteries, including 10440, 14500, 14650, 16340, 16650, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 21700, 26650, and 26500. This wide compatibility ensures that you can charge a variety of batteries with ease.

 Convenience is another key aspect of the Efest Slim K4. It features an LED indicator that allows you to monitor the charging progress at a glance. Powered by USB, this charger offers flexibility and convenience. The inclusion of a Type-C USB port further enhances its versatility.

 The charging mode of the Efest Slim K4 is both CC (Constant Current) and CV (Constant Voltage), providing a balanced and efficient charging process. It auto-detects the charging current, offering options such as 2x1.0A, 1x1.0A, 4x0.5A, and 3x0.5A, ensuring optimal performance for your batteries.

 Rest assured, the Efest Slim K4 prioritizes safety. It automatically stops charging when the batteries are fully charged, preventing any risk of overcharging. This thoughtful feature not only protects your batteries but also ensures their longevity.

 The Efest Slim K4 Battery Charger comes with a generous 3-year warranty through Efest, giving you peace of mind and confidence in your purchase. It is also compatible with a range of 3.6V/3.7V lithium-ion IMR batteries, including 10440, 14500, 16340, 17340, 18350, 18490, 18500, 18650, 20700, 21700, 26500, and 26650. This versatility makes it a reliable choice for various battery types.

 In terms of technical specifications, the Efest Slim K4 accepts input from either AC 100V-240V 50/60Hz or DC 5V 2A. The output voltage is 4.2V, with a precision of +/- 0.05V, ensuring accurate and consistent charging.

 Inside the box, you will find the Efest SLIM K4 LED battery charger, a USB cable for a convenient power supply, a user manual to guide you through the setup process, and a warranty card for your peace of mind. Additionally, the charger includes a scratch-off validation serial number, further guaranteeing the authenticity and quality of your purchase.

 Experience efficient and reliable charging with the Efest Slim K4 Battery Charger. Charge your lithium-ion batteries with confidence, knowing that safety and performance are at the forefront of this exceptional charging solution.